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This notion is being tried with commercial nurseries today (not aquatic plant nurseries). In the spectral division of light, plants use mainly the blue (about 400-430nm) and red (about 650-675 nm) wavelengths for photosynthesis. All others in the visible spectrum are not a factor in the process. Plants appear green in colour because they simply reflect this wavelength.I would also like to add that I don't want to come off as argumentative. My idea in asking for advice is definitely not to dismiss people's opinions until I get around to the one I have. I am just really really confused about it all. Is there something in aquatic plants that changes the dynamics or is it just a tried and failed method that people have experienced??
Generally speaking, most aquarists have not had the ability to tinker with the wavelengths they can supply to their aquarium until recently with the advance of LED's. One thing that you will have to be aware of are what is the limiting factor in the photosynthetic process. In providing more light it must be balanced with more nutrients and CO2, otherwise you won't see any improvement in growth. Lights that replicate natural daylight (5500k - 6500k) will do the trick, unless you are simply wanting to play. The other item that may be a factor would be the overall look of your tank while running additional blue wavelength lights. The tank will look cold and may not be pleasing to the eye. But, that is my own $0.02.